Sergei I. Ipatov
Russian Academy of Sciences
PhysicsCollisionTrans-Neptunian objectGravitationGravitational microlensingGeologyAstronomyTerrestrial planetAngular momentumZodiacal lightEarth (chemistry)AstrophysicsPlanetJupiterSolar SystemAsteroidPlanetesimalAstrobiologyCometOrbital elements
294Publications
23H-index
2,024Citations
Publications 77
Newest
#1E. A. Feoktistova (MSU: Moscow State University)
#2Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
We present a study on the relationship between the ratio of the depth of a crater to its diameter and the diameter for lunar craters both on the maria and on the highlands. We consider craters younger than 1.1 billion years in age, i.e. of Copernican period. The aim of this work is to improve our understanding of such relationships based on our new estimates of the craters's depth and diameter. Previous studies considered similar relationships for much older craters (up to 3.2 billion years). We...
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#1Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
#2E. A. Feoktistova (GAISh: Sternberg Astronomical Institute)H-Index: 1
Last. V. V. Svettsov (RAS: Russian Academy of Sciences)H-Index: 5
view all 3 authors...
We compare the number of lunar craters larger than 15 km across and younger than 1.1 Ga to the estimates of the number of craters that could have been formed for 1.1 Ga if the number of near-Earth objects and their orbital elements during that time were close to the corresponding current values. The comparison was performed for craters over the entire lunar surface and in the region of the Oceanus Procellarum and maria on the near side of the Moon. In these estimates, we used the values of colli...
2 CitationsSource
#1Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
Migration of planetesimals from the feeding zone of the terrestrial planets, which was divided into seven regions depending on the distance to the Sun, was simulated. The influence of gravity of all planets was taken into account. In some cases, the embryos of the terrestrial planets rather than the planets themselves were considered; their masses were assumed to be 0.1 or 0.3 of the current masses of the planets. The arrays of orbital elements of migrated planetesimals were used to calculate th...
1 CitationsSource
#1M. Ya. Marov (RAS: Russian Academy of Sciences)H-Index: 15
#2Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
From modeling the evolution of disks of planetesimals under the influence of planets, it has been shown that the mass of water delivered to the Earth from beyond Jupiter’s orbit could be comparable to the mass of terrestrial oceans. A considerable portion of the water could have been delivered to the Earth’s embryo, when its mass was smaller than the current mass of the Earth. While the Earth’s embryo mass was growing to half the current mass of the Earth, the mass of water delivered to the embr...
6 CitationsSource
#1Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
The dependences of inclinations of orbits of secondaries in the discovered trans-Neptunian binaries on the distance between the primary and the secondary, on the eccentricity of orbits of the secondary around the primary, on the ratio of diameters of the secondary and the primary, and on the elements of heliocentric orbits of these binaries are studied. These dependences are interpreted using the model of formation of a satellite system in a collision of two rarefied condensations composed of du...
5 CitationsSource
#1Sergei I. Ipatov (RAS: Russian Academy of Sciences)H-Index: 23
The formation of trans-Neptunian satellite systems at the stage of rarefied preplanetesimals (i.e., condensations of dust and/or objects less than 1 m in diameter) is discussed. It is assumed that trans-Neptunian objects (including those with satellites) could form as a result of compression of parental rarefied preplanetesimals. The formulas for calculating the angular momentum of two colliding condensations with respect to their center of mass, which were applied earlier in (Ipatov, 2010) in t...
7 CitationsSource
#1Akihiko FukuiH-Index: 63
#2Andrew Gould (OSU: Ohio State University)H-Index: 23
Last. Iain A. Steele (LJMU: Liverpool John Moores University)H-Index: 86
view all 62 authors...
We report the discovery of a microlensing exoplanet OGLE-2012-BLG-0563Lb with the planet–star mass ratio of \sim 1\times {10}^{-3} Intensive photometric observations of a high-magnification microlensing event allow us to detect a clear signal of the planet. Although no parallax signal is detected in the light curve, we instead succeed at detecting the flux from the host star in high-resolution JHK'-band images obtained by the Subaru/AO188 and Infrared Camera and Spectrograph instruments, allo...
50 CitationsSource
#1Akihiko FukuiH-Index: 63
#2Andrew GouldH-Index: 110
Last. Iain A. SteeleH-Index: 86
view all 61 authors...
We report the discovery of a microlensing exoplanet OGLE-2012-BLG-0563Lb with the planet-star mass ratio ~1 x 10^{-3}. Intensive photometric observations of a high-magnification microlensing event allow us to detect a clear signal of the planet. Although no parallax signal is detected in the light curve, we instead succeed at detecting the flux from the host star in high-resolution JHK'-band images obtained by the Subaru/AO188 and IRCS instruments, allowing us to constrain the absolute physical ...
50 CitationsSource
#1N. Kains (STScI: Space Telescope Science Institute)H-Index: 46
#2A. Arellano Ferro (UNAM: National Autonomous University of Mexico)H-Index: 21
Last. Olivier Wertz (University of Liège)H-Index: 33
view all 35 authors...
Aims. We analyse 20 nights of CCD observations in the V and I bands of the globular cluster M 68 (NGC 4590) and use them to detect variable objects. We also obtained electron-multiplying CCD (EMCCD) observations for this cluster in order to explore its core with unprecedented spatial resolution from the ground. Methods. We reduced our data using difference image analysis to achieve the best possible photometry in the crowded field of the cluster. In doing so, we show that when dealing with ident...
16 CitationsSource
#1N. KainsH-Index: 46
#2A. Arellano FerroH-Index: 21
Last. Olivier WertzH-Index: 33
view all 35 authors...
We analyse 20 nights of CCD observations in the V and I bands of the globular cluster M68 (NGC 4590), using these to detect variable objects. We also obtained electron-multiplying CCD (EMCCD) observations for this cluster in order to explore its core with unprecedented spatial resolution from the ground. We reduced our data using difference image analysis, in order to achieve the best possible photometry in the crowded field of the cluster. In doing so, we showed that when dealing with identical...
16 CitationsSource